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Mirrors > Home > MPE Home > Th. List > sqrtval | Structured version Visualization version GIF version |
Description: Value of square root function. (Contributed by Mario Carneiro, 8-Jul-2013.) |
Ref | Expression |
---|---|
sqrtval | ⊢ (𝐴 ∈ ℂ → (√‘𝐴) = (℩𝑥 ∈ ℂ ((𝑥↑2) = 𝐴 ∧ 0 ≤ (ℜ‘𝑥) ∧ (i · 𝑥) ∉ ℝ+))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqeq2 2783 | . . . 4 ⊢ (𝑦 = 𝐴 → ((𝑥↑2) = 𝑦 ↔ (𝑥↑2) = 𝐴)) | |
2 | 1 | 3anbi1d 1419 | . . 3 ⊢ (𝑦 = 𝐴 → (((𝑥↑2) = 𝑦 ∧ 0 ≤ (ℜ‘𝑥) ∧ (i · 𝑥) ∉ ℝ+) ↔ ((𝑥↑2) = 𝐴 ∧ 0 ≤ (ℜ‘𝑥) ∧ (i · 𝑥) ∉ ℝ+))) |
3 | 2 | riotabidv 6933 | . 2 ⊢ (𝑦 = 𝐴 → (℩𝑥 ∈ ℂ ((𝑥↑2) = 𝑦 ∧ 0 ≤ (ℜ‘𝑥) ∧ (i · 𝑥) ∉ ℝ+)) = (℩𝑥 ∈ ℂ ((𝑥↑2) = 𝐴 ∧ 0 ≤ (ℜ‘𝑥) ∧ (i · 𝑥) ∉ ℝ+))) |
4 | df-sqrt 14449 | . 2 ⊢ √ = (𝑦 ∈ ℂ ↦ (℩𝑥 ∈ ℂ ((𝑥↑2) = 𝑦 ∧ 0 ≤ (ℜ‘𝑥) ∧ (i · 𝑥) ∉ ℝ+))) | |
5 | riotaex 6935 | . 2 ⊢ (℩𝑥 ∈ ℂ ((𝑥↑2) = 𝐴 ∧ 0 ≤ (ℜ‘𝑥) ∧ (i · 𝑥) ∉ ℝ+)) ∈ V | |
6 | 3, 4, 5 | fvmpt 6589 | 1 ⊢ (𝐴 ∈ ℂ → (√‘𝐴) = (℩𝑥 ∈ ℂ ((𝑥↑2) = 𝐴 ∧ 0 ≤ (ℜ‘𝑥) ∧ (i · 𝑥) ∉ ℝ+))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ w3a 1068 = wceq 1507 ∈ wcel 2050 ∉ wnel 3067 class class class wbr 4923 ‘cfv 6182 ℩crio 6930 (class class class)co 6970 ℂcc 10327 0cc0 10329 ici 10331 · cmul 10334 ≤ cle 10469 2c2 11489 ℝ+crp 12198 ↑cexp 13238 ℜcre 14311 √csqrt 14447 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1758 ax-4 1772 ax-5 1869 ax-6 1928 ax-7 1965 ax-8 2052 ax-9 2059 ax-10 2079 ax-11 2093 ax-12 2106 ax-13 2301 ax-ext 2744 ax-sep 5054 ax-nul 5061 ax-pr 5180 |
This theorem depends on definitions: df-bi 199 df-an 388 df-or 834 df-3an 1070 df-tru 1510 df-ex 1743 df-nf 1747 df-sb 2016 df-mo 2547 df-eu 2584 df-clab 2753 df-cleq 2765 df-clel 2840 df-nfc 2912 df-ral 3087 df-rex 3088 df-rab 3091 df-v 3411 df-sbc 3676 df-dif 3826 df-un 3828 df-in 3830 df-ss 3837 df-nul 4173 df-if 4345 df-sn 4436 df-pr 4438 df-op 4442 df-uni 4707 df-br 4924 df-opab 4986 df-mpt 5003 df-id 5306 df-xp 5407 df-rel 5408 df-cnv 5409 df-co 5410 df-dm 5411 df-iota 6146 df-fun 6184 df-fv 6190 df-riota 6931 df-sqrt 14449 |
This theorem is referenced by: sqrt0 14456 resqrtcl 14468 resqrtthlem 14469 sqrtneg 14482 sqrtcl 14576 sqrtthlem 14577 |
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